Micro-subminiature microwave gyromagnetic circulator

Abstract

The present invention relates to a micro-subminiature microwave gyromagnetic circulator comprising a housing and a first ceramic ring ferrite, a central conductor, a second ceramic ring ferrite and a medium ferrule mounted inside the housing; the medium ferrule comprises a pin, and a foot of the central conductor is provided with a through-hole matching the pin; the pin comprises an extension and a fixed portion which are connected, wherein the diameter of the extension is smaller than the diameter of the fixed portion, the pins and the feet are welded at the through-holes via solder paste, and a tin-containing tank is provided at the connection between the extension and the fixed portion. The microwave gyromagnetic circulator can be micro-subminiature without decreasing bandwidth. The structure stability and conduction stability of the microwave gyromagnetic circulator are improved by welding the central conductor to the pin and providing a tin-containing tank on pin.

The invention claimed is: 
     
       1. A micro-subminiature microwave gyromagnetic circulator, comprising a housing and a compensation sheet, a first magnet, a first iron sheet, a first ceramic ring ferrite, a central conductor, a second ceramic ring ferrite, a second iron sheet, a second magnet and a medium ferrule provided successively from top to bottom and mounted inside the housing; the medium ferrule comprises a connection seat and three pins provided on the connection seat, the central conductor is Y-shaped, and three feet of the central conductor are respectively provided with through-holes matching the pins; the first ceramic ring ferrite comprises a first ceramic ring and a first ferrite sleeved in the first ceramic ring, the second ceramic ring ferrite comprises a second ceramic ring and a second ferrite sleeved in the second ceramic ring, and the dielectric constant of the first ceramic ring ferrite and the dielectric constant of the second ceramic ring ferrite are respectively greater than or equal to 30; the first ferrite and the second ferrite are respectively BiCaVIG ferrites; the pin comprises an extension and a fixed portion which are connected, the diameter of the extension is smaller than the diameter of the fixed portion fixed on the connection seat, the pins and the feet are welded at the through-holes via solder paste, the connection of the extension and the fixed portion is provided with a tin-containing tank for receiving part of the solder paste, and a bottom surface of the foot abuts against an end surface of the fixed portion near one end of the extension. 
     
     
       2. The micro-subminiature microwave gyromagnetic circulator according to  claim 1 , wherein the housing comprises a base and an upper cover, the base is composed of a bottom plate and three side plates vertically connected to the upper part of the bottom plate, the upper part of the side plates is provided with a protrusion, and the upper cover is provided with a groove in a one-to-one interference fit with the protrusion of each side plate. 
     
     
       3. The micro-subminiature microwave gyromagnetic circulator according to  claim 1 , wherein the extension is further provided with a vent slot communicating with the tin-containing tank, the tin-containing tank and the vent slot are respectively provided around the pin, and the vent slot is located on a side of the tin-containing tank away from the fixed portion. 
     
     
       4. The micro-subminiature microwave gyromagnetic circulator according to  claim 3 , wherein the tin-containing tank has a semi-circular cross section. 
     
     
       5. The micro-subminiature microwave gyromagnetic circulator according to  claim 4 , wherein an opening of the cross section of the tin-containing tank is oriented perpendicular to the central axis of the pin. 
     
     
       6. The micro-subminiature microwave gyromagnetic circulator according to  claim 5 , wherein an end surface of the fixed portion near one end of the extension is tangent to the tin-containing tank. 
     
     
       7. The micro-subminiature microwave gyromagnetic circulator according to  claim 4 , wherein the wall surface of the vent slot is tangent to the wall surface of the tin-containing tank. 
     
     
       8. The micro-subminiature microwave gyromagnetic circulator according to  claim 4 , wherein an end surface of the fixed portion near one end of the extension is provided with a step, the foot is at least partially received in the step, and a top surface of an area of the foot in the step is tangent to the tin-containing tank. 
     
     
       9. The micro-subminiature microwave gyromagnetic circulator according to  claim 1 , wherein the foot is provided with a plurality of through-holes connecting the top surface and the bottom surface of the foot, and a plurality of the through-holes are uniformly distributed around the pin. 
     
     
       10. The micro-subminiature microwave gyromagnetic circulator according to  claim 9 , wherein a receiving groove is provided on one end of the extension and is provided with a receiving groove, and the through-hole communicates with the receiving groove.